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Fix crash when using String::move on empty string (#10938) #10940

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Fix crash when using String::move on empty string (#10938) #10940

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TD-er
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@TD-er TD-er commented Feb 6, 2025

Description of Change

memmove should not be called on a nullptr or size of 0.
See: https://en.cppreference.com/w/cpp/string/byte/memmove

When an empty string was handed over to move, the application would crash.
The change is just adding an extra check to see if there is something to move.

Related links

Fixes: #10938

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github-actions bot commented Feb 6, 2025 •
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Warnings
⚠️

Some issues found for the commit messages in this PR:

  • the commit message "Fix crash when using String::move on empty string (#10938)":
    • summary looks empty
    • type/action looks empty
  • the commit message "Keep allocated memory when rhs fits":
    • summary looks empty
    • type/action looks empty
  • the commit message "No need to move 0-termination char in String::move":
    • summary looks empty
    • type/action looks empty

Please fix these commit messages - here are some basic tips:

  • follow Conventional Commits style
  • correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue
  • allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test
  • sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter
  • avoid Jira references in commit messages (unavailable/irrelevant for our customers)

TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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@TD-er TD-er marked this pull request as draft February 6, 2025 10:51
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Test Results

 62 files   62 suites   5m 39s ⏱️
 21 tests  21 ✅ 0 💤 0 ❌
153 runs  153 ✅ 0 💤 0 ❌

Results for commit d024bea.

♻️ This comment has been updated with latest results.

@TD-er
Keep allocated memory when rhs fits
7948954 
Use case: Appending to a String with pre-allocated memory (e.g. from `reserve()`)
@TD-er TD-er marked this pull request as ready for review February 6, 2025 11:01
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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

MemoryFLASH [bytes]FLASH [%]RAM [bytes]RAM [%]
TargetDECINCDECINCDECINCDECINC
ESP32P4💚 -14⚠️ +800.00⚠️ +0.01000.000.00
ESP32S3💚 -12‼️ +5K0.00⚠️ +0.500⚠️ +4960.00⚠️ +0.83
ESP32S2💚 -16‼️ +4K0.00⚠️ +0.400⚠️ +120.00⚠️ +0.02
ESP32C3💚 -1600.000.00000.000.00
ESP32C6💚 -140💚 -0.010.00000.000.00
ESP32H2💚 -1400.000.00000.000.00
ESP32💚 -24‼️ +12K0.00‼️ +1.230⚠️ +680.00⚠️ +0.11
Click to expand the detailed deltas report [usage change in BYTES]
TargetESP32P4ESP32S3ESP32S2ESP32C3ESP32C6ESP32H2ESP32
ExampleFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAM
ArduinoOTA/examples/BasicOTA⚠️ +6200000💚 -140💚 -140--00
AsyncUDP/examples/AsyncUDPClient⚠️ +78000000000--00
AsyncUDP/examples/AsyncUDPMulticastServer⚠️ +78000000000--00
AsyncUDP/examples/AsyncUDPServer⚠️ +78000000000--00
DNSServer/examples/CaptivePortal⚠️ +6200000💚 -140💚 -140--00
EEPROM/examples/eeprom_class00000000000000
EEPROM/examples/eeprom_extra00000000000000
EEPROM/examples/eeprom_write00000000000000
ESP32/examples/AnalogOut/LEDCFade00000000000000
ESP32/examples/AnalogOut/LEDCSingleChannel00000000000000
ESP32/examples/AnalogOut/LEDCSoftwareFade00000000000000
ESP32/examples/AnalogOut/SigmaDelta00000000000000
ESP32/examples/AnalogOut/ledcFrequency00000000000000
ESP32/examples/AnalogOut/ledcWrite_RGB00000000000000
ESP32/examples/AnalogRead00000000000000
ESP32/examples/AnalogReadContinuous00000000000000
ESP32/examples/ArduinoStackSize00000000000000
ESP32/examples/CI/CIBoardsTest00000000000000
ESP32/examples/ChipID/GetChipID00000000000000
ESP32/examples/DeepSleep/TimerWakeUp0000000000--00
ESP32/examples/DeepSleep/TouchWakeUp000000------00
ESP32/examples/FreeRTOS/BasicMultiThreading00000000000000
ESP32/examples/FreeRTOS/Mutex00000000000000
ESP32/examples/FreeRTOS/Queue00000000000000
ESP32/examples/FreeRTOS/Semaphore00000000000000
ESP32/examples/GPIO/BlinkRGB00000000000000
ESP32/examples/GPIO/FunctionalInterrupt00000000000000
ESP32/examples/GPIO/FunctionalInterruptStruct00000000000000
ESP32/examples/GPIO/GPIOInterrupt00000000000000
ESP32/examples/HWCDC_Events0000--000000--
ESP32/examples/MacAddress/GetMacAddress00000000000000
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ESP32/examples/RMT/RMTCallback00000000000000
ESP32/examples/RMT/RMTLoopback00000000000000
ESP32/examples/RMT/RMTReadXJT00000000000000
ESP32/examples/RMT/RMTWrite_RGB_LED00000000000000
ESP32/examples/RMT/RMT_CPUFreq_Test00000000000000
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ESP32/examples/RMT/RMT_LED_Blink00000000000000
ESP32/examples/ResetReason/ResetReason00000000000000
ESP32/examples/ResetReason/ResetReason200000000000000
ESP32/examples/Serial/BaudRateDetect_Demo00000000000000
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ESP32/examples/Timer/WatchdogTimer00000000000000
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Ethernet/examples/ETH_W5500_Arduino_SPI⚠️ +760000000000000
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Ethernet/examples/ETH_WIFI_BRIDGE⚠️ +76000000000--00
FFat/examples/FFat_Test💚 -140💚 -40💚 -40💚 -140💚 -140💚 -140💚 -120
FFat/examples/FFat_time⚠️ +6400000💚 -140💚 -140--💚 -120
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HTTPClient/examples/BasicHttpClient⚠️ +6400000💚 -140💚 -140--00
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PPP/examples/PPP_WIFI_BRIDGE⚠️ +76000000000--00
Preferences/examples/Prefs2Struct00000000000000
Preferences/examples/StartCounter00000000000000
SD/examples/SD_Test💚 -140💚 -40💚 -40💚 -140💚 -140💚 -140💚 -120
SD/examples/SD_time⚠️ +6400000💚 -140💚 -140--00
SD_MMC/examples/SD2USBMSC💚 -140💚 -40----------
SD_MMC/examples/SDMMC_Test💚 -140💚 -40--------💚 -120
SD_MMC/examples/SDMMC_time⚠️ +64000--------00
SPI/examples/SPI_Multiple_Buses00000000000000
SPIFFS/examples/SPIFFS_Test💚 -140💚 -40💚 -40💚 -160💚 -140💚 -140💚 -120
SPIFFS/examples/SPIFFS_time⚠️ +640💚 -120💚 -160💚 -140💚 -140--00
TFLiteMicro/examples/hello_world00000000000000
Ticker/examples/Blinker00000000000000
Ticker/examples/TickerBasic00000000000000
Ticker/examples/TickerParameter00000000000000
USB/examples/CompositeDevice000000--------
USB/examples/ConsumerControl000000--------
USB/examples/CustomHIDDevice000000--------
USB/examples/FirmwareMSC000000--------
USB/examples/Gamepad000000--------
USB/examples/HIDVendor000000--------
USB/examples/Keyboard/KeyboardLogout000000--------
USB/examples/Keyboard/KeyboardMessage000000--------
USB/examples/Keyboard/KeyboardReprogram000000--------
USB/examples/Keyboard/KeyboardSerial000000--------
USB/examples/KeyboardAndMouseControl000000--------
USB/examples/MIDI/MidiController000000--------
USB/examples/MIDI/MidiInterface000000--------
USB/examples/MIDI/MidiMusicBox000000--------
USB/examples/MIDI/ReceiveMidi000000--------
USB/examples/Mouse/ButtonMouseControl000000--------
USB/examples/SystemControl000000--------
USB/examples/USBMSC000000--------
USB/examples/USBSerial000000--------
USB/examples/USBVendor000000--------
Update/examples/AWS_S3_OTA_Update⚠️ +78000000000--00
Update/examples/HTTPS_OTA_Update⚠️ +76000000000--00
Update/examples/HTTP_Client_AES_OTA_Update⚠️ +6400000💚 -140💚 -140--00
Update/examples/HTTP_Server_AES_OTA_Update⚠️ +6400000💚 -140💚 -140--💚 -120
Update/examples/OTAWebUpdater⚠️ +6600000💚 -140💚 -140--00
Update/examples/SD_Update💚 -140💚 -40💚 -40💚 -140💚 -140💚 -140💚 -120
WebServer/examples/AdvancedWebServer⚠️ +64000💚 -120💚 -140💚 -140--00
WebServer/examples/FSBrowser⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/Filters⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/HelloServer⚠️ +6600000💚 -140💚 -140--00
WebServer/examples/HttpAdvancedAuth⚠️ +6200000💚 -140💚 -140--00
WebServer/examples/HttpAuthCallback⚠️ +640💚 -12000💚 -140💚 -140--00
WebServer/examples/HttpAuthCallbackInline⚠️ +6400000💚 -140💚 -140--💚 -240
WebServer/examples/HttpBasicAuth⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/HttpBasicAuthSHA1⚠️ +6400000💚 -140💚 -140--💚 -120
WebServer/examples/HttpBasicAuthSHA1orBearerToken⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/MultiHomedServers⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/PathArgServer⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/SDWebServer⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/SimpleAuthentification⚠️ +640💚 -12000💚 -140💚 -140--00
WebServer/examples/UploadHugeFile⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/WebServer⚠️ +6400000💚 -140💚 -140--00
WebServer/examples/WebUpdate⚠️ +6400000💚 -140💚 -140--00
WiFi/examples/FTM/FTM_Initiator⚠️ +78000000000--00
WiFi/examples/FTM/FTM_Responder⚠️ +76000000000--00
WiFi/examples/SimpleWiFiServer⚠️ +78000000000--00
WiFi/examples/WiFiAccessPoint⚠️ +78000000000--00
WiFi/examples/WiFiClient⚠️ +78000000000--00
WiFi/examples/WiFiClientBasic⚠️ +80000000000--00
WiFi/examples/WiFiClientConnect⚠️ +780⚠️ +160000000--00
WiFi/examples/WiFiClientEvents⚠️ +76000000000--00
WiFi/examples/WiFiClientStaticIP⚠️ +78000000000--00
WiFi/examples/WiFiExtender⚠️ +76000000000--00
WiFi/examples/WiFiIPv6⚠️ +76000000000--00
WiFi/examples/WiFiMulti⚠️ +76000000000--00
WiFi/examples/WiFiMultiAdvanced⚠️ +6400000💚 -140💚 -140--00
WiFi/examples/WiFiScan⚠️ +78000000000--00
WiFi/examples/WiFiScanAsync⚠️ +76000000000--00
WiFi/examples/WiFiScanDualAntenna⚠️ +78000000000--00
WiFi/examples/WiFiScanTime⚠️ +80000000000--00
WiFi/examples/WiFiTelnetToSerial⚠️ +78000000000--00
WiFi/examples/WiFiUDPClient⚠️ +80000000000--00
Wire/examples/WireMaster00000000000000
Wire/examples/WireScan00000000000000
Wire/examples/WireSlave00000000000000
BLE/examples/BLE5_extended_scan--00--💚 -140💚 -140💚 -140--
BLE/examples/BLE5_multi_advertising--00--💚 -140💚 -140💚 -140--
BLE/examples/BLE5_periodic_advertising--00--💚 -140💚 -140💚 -140--
BLE/examples/BLE5_periodic_sync--00--💚 -140💚 -140💚 -140--
BLE/examples/Beacon_Scanner--00--💚 -140💚 -140💚 -14000
BLE/examples/Client--00--💚 -140💚 -140💚 -14000
BLE/examples/EddystoneTLM_Beacon--00--💚 -140💚 -140💚 -14000
BLE/examples/EddystoneURL_Beacon--00--💚 -140💚 -140💚 -14000
BLE/examples/Notify--00--💚 -140💚 -140💚 -14000
BLE/examples/Scan--00--💚 -140💚 -140💚 -14000
BLE/examples/Server--00--💚 -140💚 -140💚 -14000
BLE/examples/Server_multiconnect--00--💚 -140💚 -140💚 -140💚 -120
BLE/examples/UART--00--💚 -140💚 -140💚 -14000
BLE/examples/Write--00--💚 -140💚 -140💚 -14000
BLE/examples/iBeacon--00--💚 -140💚 -140💚 -14000
ESP32/examples/Camera/CameraWebServer--‼️ +5K⚠️ +496‼️ +4K⚠️ +12------‼️ +12K⚠️ +68
ESP32/examples/DeepSleep/ExternalWakeUp--0000------00
ESP_NOW/examples/ESP_NOW_Broadcast_Master--00000000--00
ESP_NOW/examples/ESP_NOW_Broadcast_Slave--00000000--00
ESP_NOW/examples/ESP_NOW_Network--00000000--00
ESP_NOW/examples/ESP_NOW_Serial--00000000--00
ESP_SR/examples/Basic--00----------
HTTPClient/examples/HTTPClientEnterprise--0000💚 -140💚 -140--00
Insights/examples/DiagnosticsSmokeTest--00000000--00
Insights/examples/MinimalDiagnostics--00000000--00
Matter/examples/MatterColorLight--00000000--00
Matter/examples/MatterCommissionTest--00000000--00
Matter/examples/MatterComposedLights--00000000--00
Matter/examples/MatterContactSensor--00000000--00
Matter/examples/MatterDimmableLight--00000000--00
Matter/examples/MatterEnhancedColorLight--00000000--00
Matter/examples/MatterFan--00000000--00
Matter/examples/MatterHumiditySensor--00000000--00
Matter/examples/MatterMinimum--00000000--00
Matter/examples/MatterOccupancySensor--00000000--00
Matter/examples/MatterOnIdentify--00000000--00
Matter/examples/MatterOnOffLight--00000000--00
Matter/examples/MatterOnOffPlugin--00000000--00
Matter/examples/MatterPressureSensor--00000000--00
Matter/examples/MatterSmartButon--00000000--00
Matter/examples/MatterTemperatureLight--00000000--00
Matter/examples/MatterTemperatureSensor--00000000--00
Matter/examples/MatterThermostat--00000000--00
Matter/examples/WiFiProvWithinMatter--00000000--00
NetworkClientSecure/examples/WiFiClientSecureEnterprise--00000000--00
RainMaker/examples/RMakerCustom--00000000--00
RainMaker/examples/RMakerCustomAirCooler--00000000----
RainMaker/examples/RMakerSonoffDualR3--00000000----
RainMaker/examples/RMakerSwitch--00000000--00
SimpleBLE/examples/SimpleBleDevice--00--00000000
WebServer/examples/Middleware--💚 -120💚 -120💚 -140💚 -140--00
WiFi/examples/WPS--00000000--00
WiFi/examples/WiFiBlueToothSwitch--00--0000--00
WiFi/examples/WiFiClientEnterprise--00000000--00
WiFi/examples/WiFiSmartConfig--00000000--00
WiFiProv/examples/WiFiProv--00000000--00
OpenThread/examples/COAP/coap_lamp--------0000--
OpenThread/examples/COAP/coap_switch--------0000--
OpenThread/examples/SimpleCLI--------0000--
OpenThread/examples/SimpleNode--------0000--
OpenThread/examples/SimpleThreadNetwork/ExtendedRouterNode--------0000--
OpenThread/examples/SimpleThreadNetwork/LeaderNode--------0000--
OpenThread/examples/SimpleThreadNetwork/RouterNode--------0000--
OpenThread/examples/ThreadScan--------0000--
OpenThread/examples/onReceive--------0000--
Zigbee/examples/Zigbee_CarbonDioxide_Sensor--------0000--
Zigbee/examples/Zigbee_Color_Dimmable_Light--------0000--
Zigbee/examples/Zigbee_Color_Dimmer_Switch--------0000--
Zigbee/examples/Zigbee_Contact_Switch--------0000--
Zigbee/examples/Zigbee_Dimmable_Light--------0000--
Zigbee/examples/Zigbee_Occupancy_Sensor--------0000--
Zigbee/examples/Zigbee_On_Off_Light--------0000--
Zigbee/examples/Zigbee_On_Off_Switch--------0000--
Zigbee/examples/Zigbee_Pressure_Flow_Sensor--------0000--
Zigbee/examples/Zigbee_Scan_Networks--------0000--
Zigbee/examples/Zigbee_Temp_Hum_Sensor_Sleepy--------0000--
Zigbee/examples/Zigbee_Temperature_Sensor--------0000--
Zigbee/examples/Zigbee_Thermostat--------0000--
Zigbee/examples/Zigbee_Window_Covering--------0000--
BluetoothSerial/examples/DiscoverConnect------------00
BluetoothSerial/examples/GetLocalMAC------------00
BluetoothSerial/examples/SerialToSerialBT------------00
BluetoothSerial/examples/SerialToSerialBTM------------00
BluetoothSerial/examples/SerialToSerialBT_Legacy------------00
BluetoothSerial/examples/SerialToSerialBT_SSP------------00
BluetoothSerial/examples/bt_classic_device_discovery------------00
BluetoothSerial/examples/bt_remove_paired_devices------------00
ESP32/examples/DeepSleep/SmoothBlink_ULP_Code------------00
Ethernet/examples/ETH_LAN8720------------00

@TD-er TD-er mentioned this pull request Feb 6, 2025
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TD-er commented Feb 6, 2025

Included in single PR: #10945

@TD-er TD-er closed this Feb 6, 2025
@TD-er TD-er deleted the patch-2 branch February 6, 2025 15:40
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Crash when using String::move on empty string
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